Tex-719-I, Sampling High Strength Bolts, Nuts, and
Washers
Contents:
Section 1 — Overview..............................................................................................................2
Section 2 — Sampling Information..........................................................................................3
Section 3 — Procedures............................................................................................................4
Section 4 — Documentation.....................................................................................................6
Section 5 — Tagging/Labeling, Documenting, and Shipping..................................................7
Texas Department of Transportation
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Tex-719-I, Sampling High Strength Bolts, Nuts, and
Washers
Section 1 — Overview
Section 1
Overview
Effective dates: August 1999–February 2008.
This method outlines the procedure for sampling ASTM A 325 and ASTM A 490 bolts,
nuts, and washers used as high strength fasteners.
Units of Measurement
The values given in parentheses (if provided) are not standard and may not be exact
mathematical conversions. Use each system of units separately. Combining values from the
two systems may result in nonconformance with the standard.
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Tex-719-I, Sampling High Strength Bolts, Nuts, and
Washers
Section 2 — Sampling Information
Section 2
Sampling Information
Sampling shall be done by lot and by an authorized representative of TxDOT.
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Tex-719-I, Sampling High Strength Bolts, Nuts, and
Washers
Section 3 — Procedures
Section 3
Procedures
Visual Inspection
The sampler shall perform a visual inspection of the bolts for head bursts (an open break in
the metal which can occur on the flats or corners of bolt heads). A defective bolt, for the
purpose of visual inspection for bursts, is any bolt that contains a burst on the flat of the
head which extends into the crown surface of the head (chamfer circle) or the under-head
bearing surface, or at the intersection of two wrenching surfaces.
A lot, for the purpose of visual inspection, consists of all bolts of one type having the same
nominal diameter and length offered for inspection at one time.
A representative sample quantity shall be picked at random from each of the bolt lots and
visually inspected for bursts. The sample size shall be as shown in the following table. If the
number of defective bolts is greater than the acceptance level cited in the table, the lot shall
be subject to rejection and shall not be sampled for mechanical testing.
Lot Quantity
2 to 8
9 to 15
16 to 25
26 to 150
151 to 280
281 to 500
501 to 1,200
1,201 to 3,200
3,201 to 10,000
10,001 to 35,000
ASTM A325/A490 Bolts
Number of Samples
2
3
5
20
32
50
80
125
200
315
Acceptance Level
0
0
0
1
2
3
5
7
10
14
Mechanical Testing
ASTM A 325 High Strength Bolts – A lot, for the purpose of selecting samples for
mechanical testing, is defined as that quantity of bolts of the same nominal diameter and
length necessary to fill the requirements of a single purchase order. From each lot, the
minimum number of samples is indicated in the following table.
ASTM A325 Bolts
Lot Quantity
Number of Samples
500 or less
3
501 to 1,200
5
1,201 to 3,200
8
3,201 to 10,000
13
10,001 and over
20
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Washers
Section 3 — Procedures
ASTM A 490 High Strength Bolts – A lot, for the purpose of selecting samples for
mechanical testing, is defined as that quantity of bolts of the same nominal diameter and
length necessary to fill the requirements of a single purchase order. From each lot, the
minimum number of samples is indicated in the following table.
ASTM A490 Bolts
Lot Quantity
Number of Samples
150 or less
3
151 to 1,200
5
1,201 to 10,000
8
10,001 to 35,000
13
35,001 to 150,000
20
150,001 and over
32
ASTM Nuts for use with ASTM A 325 High Strength Bolts and ASTM A 490 High
Strength Bolts – A lot, for the purpose of selecting test samples for mechanical testing,
consists of all material offered for inspection at one time with the following common
characteristics: the same nominal size, grade, type, style, thread series, class, and surface
finish. From each lot, the minimum number of samples is indicated in the following table.
Nuts
Lot Quantity
Number of Samples
8,000 or less
2
8,001 to 22,000
3
22,001 and over
5
Washers for use with ASTM A 325 High Strength Bolts and ASTM A 490 High Strength
Bolts shall be sampled at the same rate as nuts.
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Tex-719-I, Sampling High Strength Bolts, Nuts, and
Washers
Section 4 — Documentation
Section 4
Documentation
All samples shall be accompanied by the original signed and notarized Form D-9-USA-1,
"Material Statement," with mill test reports and certifications attached (reference
'Buy America Documentation Program' section of the CST/M&P 'Material Inspection
Guide').
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Tex-719-I, Sampling High Strength Bolts, Nuts, and
Washers
Section 5 — Tagging/Labeling, Documenting, and
Shipping
Section 5
Tagging/Labeling, Documenting, and Shipping
Follow the 'General Requirements' as detailed in "Tagging/Labeling, Documenting, and
Shipping General Requirements." In addition:
♦
provide name of producer, size, grade, type, heat or sample number
♦
carefully wrap samples
♦
wrap completed packages to prevent damage during transit.
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